Hye and good morning.

I'm a computer science student.
Exploring pharmacy area is new for me.
So I need a help from the expert to answer my questions.

My questions are:
1. What are anti-cancer drugs for breast cancer? Is it different for every stage of breast cancer?

2. Does drugs properties is similar to DNA, (ex: DNA --> ACTG)? or Does drug is a form of molecule only?

3. In order to treat breast cancer patient, is drugs given are applied based on try and error concept? Is there any drugs developed based on patients genes currently (to prevent from side effect and give more effective treatment to patients) ?

4. Do you provide any data for student like me to run my research?

Thank you in advancer
Izyan K